Cranes may only be used with due regard for the written operating instructions that have to be drawn up by the manufacturer. The minimum content of such operating instructions is set forth in Section 19 of the Work Equipment Regulation (Arbeitsmittelverordnung, AM-VO). Furthermore, every crane operator must havea permit to drive issued by the employer in accordance with Section 33 of the Work Equipment Regulation. Every crane operation has to be planned and monitored. Prior to putting cranes into operation all safety relevant features (i.e. brake function) have to be checked. If persons are to be lifted by crane in working baskets (carriers), specific requirements have to be met.